How To Order Two ArrayList In One

I have an ArrayList of employee and ArrayLsit of bosses, and I want to keep those people in a temporary ArrayList , then ordain alphabetically by name, to sort I use the interface comparator.

The problem comes when I will order 2 ArrayList(workers and bosses), because every time I call I use these functions or not is ordered (sortByNameAlphabetical())

public class Employee {
private String name;
public String getName() {
return name;
}
@Override
public String toString() {
return name ;

[Code]...